'Operation 596' on 16 October 1964: China's first nuclear test

16 October 1964 - First Chinese nuclear test

The first Chinese test had a yield of 22 kilotons.

On 16 October 1964, the People’s Republic of China conducted its first nuclear test, making it the fifth nuclear-armed state after the United States, the Soviet Union, Britain and France. China had initiated its nuclear weapons programme in the mid-1950s, after the Korean war. At the outset, its efforts were backed by substantial Soviet assistance, including advisors and technical equipment. Research on nuclear weapon design began at the Institute of Physics and Atomic Energy in Beijing, and a uranium enrichment plant was constructed in Lanzhou to produce weapon-grade uranium.

Mao and Khrushchev

With the cooling of Sino-Soviet relations in the late 1950s, the Soviet Union withdrew all assistance. In June 1959, Nikita Khrushchev decided to refuse the provision of a prototype bomb to the Chinese. This rupture prompted China to embark on its own nuclear testing project, code-named 59-6 after the month in which it was initiated.

Map of Lop Nor

Operation 59-6 was carried out at the Lop Nur test site in the Gobi desert of Xinjiang province, Western China, close to the ancient Silk Route. An implosion-type device was mounted from the top of a steel tower, producing a yield of 22 kilotons. It was the first of a total of 45 Chinese nuclear tests, all of which were conducted at Lop Nur. Twenty three of these tests were atmospheric and 22 underground, the yields ranging from 1 kiloton to 4 megatons. On 17 June 1967, just three years after operation 59-6 – faster than other nuclear weapon possessors - China detonated its first hydrogen bomb.

Soldiers rode on horseback towards the mushroom clouds.

The effects of China’s nuclear testing on human health, animals and the environment are largely unexplored due to the lack of publically available official data. The Xinjiang region is the largest Chinese administrative division and home to 20 million people of different ethnic backgrounds. A study carried out by the Japanese physicist Professor Jun Takada suggests that peak levels of radioactivity from China’s large-yield tests exceeded that of the 1986 Chernobyl reactor accident and seriously affected local populations.

In 2008, China started to pay undisclosed subsidies to personnel involved in nuclear testing. Compensation, however, has not been extended to civilian residents of the Xinjiang area, downwind of the Lop Nur test site.

China signed the CTBT on the very day it opened for signature, but has yet to ratify.

China conducted its last test on 29 July 1996, only two months prior to signing the Comprehensive Nuclear-Test-Ban Treaty (CTBT) on 24 September 1996. However, it has yet to ratify the CTBT, a step that is mandatory for the Treaty’s entry into force. Ratifications of seven other nuclear-capable states are also missing: the Democratic People’s Republic of Korea, Egypt, India, Israel, Iran, Pakistan and the United States.

Clip from the documentary "Trinity and Beyond", directed by Peter Kuran.